Connection block



April 1930- J. w. TENNANT 1,752,469

NNNNNNN R Patented Apr. 1, 1930 UNITED STATES PATENT OFFICE JOHN WILLIAM TENNANT, OF MUJDLESEX, ENGLAND, ASSIGNOR TO RADIO CORPORA- TION OF AMERICA, A CORPORATION OF DELAWARE COHNECTZGII BLOCK Application filed March 16,

One object of the present invention is to provide an adapter for quickly and easily reversing the connections of an electrical devlce.

Another object is to provide an adapter for quickly and easily reversing the connections of an electrical device and for short circuiting the device at will.

When using coils of the plug-in type for reaction purposes, it is often necessary to reverse the windings of the coil. 1 s the coils are usually made with the ends of the windings taken to a plug and socket connection and the coil holder is fitted with a plug and socket, it is only possible to put the coil into the holder in one way and therefore it becomes necessary to disconnect the wires either to the holder or the coil when it is desired to reverse the connections. The present invention consists of an adapter by means of which the direction of the windings can be reversed, and in addition the coil can be short circuited when reaction is not needed.

The adap er consists of a piece of ebonite or like insulating material on which is mounted a double pole double throw switch of any convenient type. VZhen the arm of this switch is in one position, the winding is in the same direction as if the adapter were not used, but on the arm being thrown into the other position the winding is reversed.

The switch may be provided with additional contacts so arranged that when the arm is thrown into a midway position, the coil will be short circuited and therefore there is no need toremove the coil when reaction is not wanted.

The invention is illustrated by the accompanying drawing, in which Fig. 1 is a plan view of the adapter,

Fig. 2 a side elevation thereof,

Fig. 3 a section on the line 33 of Fig.2, and

Fig. 4; is a view similar to Fig. 3 of another adapter of a different kind.

Fig. 5 is a sectional view of a coil holder.

A is a block or ebonite or like insulating material provided with two plugs B B and two sockets C G On the top of the block is a double pole double switch by means of 1925, Serial No. 15,734, and in Great Britain March 21, 1924.

which the connections of the coil can be reversed. The dotted lines in Fig. 1 represent the electrical connections of the several contacts mounted on the block. The coil holder 2, shown in Fig. 5, has embodied therein a coil 1, one of the ends of which coil is connected to a plug 3, the other end being connected to a socket at. Thus, in use, the plug 3 is received in a socket of the block A, and the socket i of the holder 2 receives a plug of the block A. In this Way, the holder may be easily reversed. V] hen the arm D of the switch is in the position shown in Fig. 1 the coil 1 is connected in the same direct-ion to that in which it would be connected if the adapter were not in use. When the arm D of the switch is thrown right over the connection is reversed. E is an additional contact so arranged that when the arm Dis in contact with it the coil is shortcircuited; Ob viously the coil 1 may be permanently secured to the block A if desired. 7

As this adapter would bring thereaction coil out of alinement with the aerial coil another adapter may be employed for the aerial coil; such an adapter, is shown in Fig.4 and consists of a block of ebonite with two plugs and sockets. p

c Having now particularly described and certained the nature of my said invention and in what manner the same is to be performed, 'Ideclare that what I claim is: V 1. A connection block for use with coils of the plug-in type comprising an insulating base, eluding a pair of plugs anda pair of sockets for connecting two coils in circuit with each other, a double-pole doublethrow switch on said base, and electrical connections between said switch and said contacts for reversing the connections of one of said coils, and an additional contact on said base whereby the connections between the first mentioned contacts may be short-circuited. r

'2. In combination, a connection block having an insulating base, a pair of contacts on each side of said base comprising a projecting plug and a set-in socket for connecting a coil oi the plug-in type to each pair of contacts, a doublepole double-throw switch a plurality ot' contacts on said base in mounted on said base, and electrical connections between said first-mentioned contacts and the switch poles whereby the coils may be connected directly to each other in one posi- 5 tion of the switch and reversed in respect to each other in another position of the switch.

3. A connection block comprising an insulating base, two pairs of contacts mounted thereon, a double throw switch mounted on said base, electrical connections between said switch and said pairs of contacts for connecting said pairs of contacts in one position of said switch and for reversing the connections between said pairs of contacts in another po sition of said switch and an additional switch contact on said base with connections for short circuiting one of said pairs of contacts in a third position of said switch.

4. A device for reversing the direction of 0 the windings of a pair of coils, including a connection block and means for connecting each of said coils thereto, a double-pole doublethrow switch, and connections between the poles, whereby in one position of the switch the windings of the coils will be in one direction, and in theother position of the switch, the windings of the coils will be in reverse direction.

5. In a connection block, an insulating base, so two pair of contacts mounted thereon and having connections therebetween, means for reversing the connections between said contacts, and an additional contact on said base whereby the connections between the first mentioned contacts may be short-circuited.

6. A device for reversing the direction of the windings of a pair of coils, includin a connection block having a plug and a soc 'et on each side thereof for connecting one of the 40 coils thereto, a double-pole double-throw switch, and connections between the plugs and sockets and the poles, and alsobetween the poles, whereby in one position of the switch the coil windings will be in one direction, and in the other position of the switch, the coil windings will be in reverse direction.

7. A connection block comprising an insulating base having two pairs of contacts for connecting a pair of coils of the plug-in type thereto, a double-pole double-throw switch mounted on said base, and electrical connections between one pair of said first mentioned contacts and the middle switch poles and between the other pair of said first mentioned contacts and a pair of oppositely arranged switch poles, and additional connections between each pair of diagonally opposite switch poles.

JOHN lVILLIAM TENNANT. 

